package com.lazy.rabbit.demo.workqueues;

import java.io.IOException;

import com.rabbitmq.client.*;

public class Worker {
    private static final String TASK_QUEUE_NAME = "task_queue";

    public static void main(String[] argv) throws Exception {
      ConnectionFactory factory = new ConnectionFactory();
      factory.setHost("localhost");
      final Connection connection = factory.newConnection();
      final Channel channel = connection.createChannel();

      channel.queueDeclare(TASK_QUEUE_NAME, true, false, false, null);
      System.out.println(" [*] Waiting for messages. To exit press CTRL+C");

      channel.basicQos(1);

      final Consumer consumer = new DefaultConsumer(channel) {
        @Override
        public void handleDelivery(String consumerTag, Envelope envelope, AMQP.BasicProperties properties, byte[] body) throws IOException {
          String message = new String(body, "UTF-8");

          System.out.println(" [x] Received '" + message + "'");
          try {
            doWork(message);
          } finally {
            System.out.println(" [x] Done");
            channel.basicAck(envelope.getDeliveryTag(), false);
          }
        }
      };
      channel.basicConsume(TASK_QUEUE_NAME, false, consumer);
    }

    private static void doWork(String task) {
      for (char ch : task.toCharArray()) {
        if (ch == '.') {
          try {
            Thread.sleep(1000);
          } catch (InterruptedException _ignored) {
            Thread.currentThread().interrupt();
          }
        }
      }
    }
}
